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• ffmpeg : cannot copy data stream

  31 mars 2023, par darkshine — mp4, h.264, h.265, ffmpeg

  I've got the mp4 video file captured by DJI drone. The file contains the video stream and two data streams of unknown format. I would like to convert the video from h.264 to h.265 and also save the both data streams. Unfortunately, I cannot force ffmpeg to copy the data streams from input to the output.

  


  Here is the mp4 file :

  


  ffprobe DJI_0019.MP4

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5631004c2730] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'DJI_0019.MP4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : replaced_timestamp
    encoder         : DJIMavic3
  Duration: 00:01:05.66, start: 0.000000, bitrate: 128915 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 127648 kb/s, 29.41 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : replaced_timestamp
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Data: none (djmd / 0x646D6A64), 13 kb/s
    Metadata:
      creation_time   : replaced_timestamp
      handler_name    : DJI meta
  Stream #0:2(und): Data: none (dbgi / 0x69676264), 1190 kb/s
    Metadata:
      creation_time   : replaced_timestamp
      handler_name    : DJI dbgi
  Stream #0:3: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 960x540 [SAR 1:1 DAR 16:9], 90k tbr, 90k tbn, 90k tbc (attached pic)
Unsupported codec with id 0 for input stream 1
Unsupported codec with id 0 for input stream 2


  


  I tried the command below :

  


  ffmpeg -i DJI_0019.MP4 -map 0 -c:v libx265 -crf 25 -c:d copy -copy_unknown DJI_0019.v2.MP4

  


  The command fails with the following error. The output file is empty.

  


  [mp4 @ 0x556d0180ced0] Could not find tag for codec none in stream #1, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --


  


  Note that for "-c:d" option I tried different suggested values, none of them succeeded :

  


  copy
none
bin
bin_data
data
null
file


  


  In the meantime an attempt to save the data streams to separate files succeeds for the both of them with the commands :

  


  ffmpeg -i DJI_0019.MP4 -map 0:d:0 -c copy -copy_unknown -f data DJI_0019.data0.bin

  


  ffmpeg -i DJI_0019.MP4 -map 0:d:1 -c copy -copy_unknown -f data DJI_0019.data1.bin

  


  How to force ffmpeg to copy the data streams from input to output ?

  


  This is the ffmpeg's info :

  


  ffmpeg version 4.4.3 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 11.3.0 (Gentoo 11.3.0 p5)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 
--docdir=/usr/share/doc/ffmpeg-4.4.3/html --mandir=/usr/share/man --enable-shared 
--cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar 
--nm=x86_64-pc-linux-gnu-nm --strip=x86_64-pc-linux-gnu-strip 
--ranlib=x86_64-pc-linux-gnu-ranlib --pkg-config=x86_64-pc-linux-gnu-pkg-config 
--optflags='-O2 -pipe -march=native' --disable-static --enable-avfilter --enable-avresample 
--disable-stripping --disable-optimizations --disable-libcelt --disable-indev=oss 
--disable-indev=jack --disable-indev=sndio --disable-outdev=oss --disable-outdev=sndio 
--enable-nonfree --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-gcrypt 
--enable-gnutls --disable-gmp --enable-gpl --disable-hardcoded-tables --enable-iconv 
--disable-libxml2 --disable-lzma --enable-network --disable-opencl --disable-openssl 
--enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --disable-vaapi 
--disable-vdpau --disable-vulkan --enable-xlib --enable-libxcb --enable-libxcb-shm 
--enable-libxcb-xfixes --enable-zlib --enable-libcdio --disable-libiec61883 
--disable-libdc1394 --enable-libcaca --disable-openal --disable-opengl --enable-libv4l2 
--disable-libpulse --disable-libdrm --disable-libjack --disable-libopencore-amrwb 
--disable-libopencore-amrnb --disable-libcodec2 --enable-libdav1d --enable-libfdk-aac 
--disable-libopenjpeg --disable-libbluray --disable-libgme --disable-libgsm 
--disable-libaribb24 --disable-mmal --disable-libmodplug --disable-libopus 
--disable-libilbc --disable-librtmp --disable-libssh --disable-libspeex --disable-libsrt 
--disable-librsvg --disable-ffnvcodec --disable-libvorbis --disable-libvpx --disable-libzvbi 
--disable-appkit --disable-libbs2b --disable-chromaprint --disable-cuda-llvm 
--disable-libflite --disable-frei0r --disable-libvmaf --disable-libfribidi 
--disable-fontconfig --disable-ladspa --enable-libass --disable-libtesseract 
--disable-lv2 --disable-libfreetype --disable-libvidstab --disable-librubberband 
--disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-amf 
--disable-libvo-amrwbenc --disable-libkvazaar --disable-libaom --enable-libmp3lame 
--disable-libopenh264 --disable-librav1e --disable-libsnappy --disable-libsvtav1 
--disable-libtheora --disable-libtwolame --disable-libwebp --enable-libx264 --enable-libx265 
--enable-libxvid --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon 
--disable-vfp --disable-vfpv3 --disable-armv8 --disable-mipsdsp --disable-mipsdspr2 
--disable-mipsfpu --disable-altivec --disable-vsx --disable-power8 --disable-amd3dnow 
--disable-amd3dnowext --disable-aesni --disable-avx --disable-avx2 --disable-fma3 
--disable-fma4 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-xop 
--cpu=host --disable-doc --disable-htmlpages --enable-manpages
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100


  


• RTP packets detected as UDP

  28 février 2017, par user3172852

  Here is what I am trying to do :

  WebRTC endpoint > RTP Endpoint > ffmpeg > RTMP server.

  This is what my SDP file looks like.

  var cm_offer = "v=0\n" +
  
                "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +
  
                "s=nginx\n" +
  
                "c=IN IP4 127.0.0.1\n" +
  
                "t=0 0\n" +
  
                "m=audio 60820 RTP/AVP 0\n" +
  
                "a=rtpmap:0 PCMU/8000\n" +
  
                "a=recvonly\n" +
  
                "m=video 59618 RTP/AVP 101\n" +
  
                "a=rtpmap:101 H264/90000\n" +
  
                "a=recvonly\n";

  What’s happening is that wireshark can detect the incoming packets at port 59618, but not as RTP packets but UDP packets. I am trying to capture the packets using ffmpeg with the following command :

  ubuntu@ip-132-31-40-100:~$ ffmpeg -i udp://127.0.0.1:59618 -vcodec copy stream.mp4
  
  ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
    libavutil      55. 44.100 / 55. 44.100
  
    libavcodec     57. 75.100 / 57. 75.100
  
    libavformat    57. 63.100 / 57. 63.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 69.100 /  6. 69.100
  
    libavresample   3.  2.  0 /  3.  2.  0
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100 

  All I get is a blinking cursor and The stream.mp4 file is not written to disk after I exit (ctrl+c).

  So can you help me figure out :

  1. why wireshark cannot detect the packets as RTP (I suspect it has something to do with SDP)
  2. How to handle SDP answer when the RTP endpoint is pushing to ffmpeg which doesn’t send an answer back.

  Here is the entire code (hello world tutorial modified)

  /*
  
       * (C) Copyright 2014-2015 Kurento (http://kurento.org/)
  
       *
  
       * Licensed under the Apache License, Version 2.0 (the "License");
  
       * you may not use this file except in compliance with the License.
  
       * You may obtain a copy of the License at
  
       *
  
       *   http://www.apache.org/licenses/LICENSE-2.0
  
       *
  
       * Unless required by applicable law or agreed to in writing, software
  
       * distributed under the License is distributed on an "AS IS" BASIS,
  
       * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  
       * See the License for the specific language governing permissions and
  
       * limitations under the License.
  
       */
  
  
  
      function getopts(args, opts)
  
      {
  
        var result = opts.default || {};
  
        args.replace(
  
            new RegExp("([^?=&]+)(=([^&]*))?", "g"),
  
            function($0, $1, $2, $3) { result[$1] = decodeURI($3); });
  
  
  
        return result;
  
      };
  
  
  
      var args = getopts(location.search,
  
      {
  
        default:
  
        {
  
          ws_uri: 'wss://' + location.hostname + ':8433/kurento',
  
          ice_servers: undefined
  
        }
  
      });
  
  
  
      function setIceCandidateCallbacks(webRtcPeer, webRtcEp, onerror)
  
      {
  
        webRtcPeer.on('icecandidate', function(candidate) {
  
          console.log("Local candidate:",candidate);
  
  
  
          candidate = kurentoClient.getComplexType('IceCandidate')(candidate);
  
  
  
          webRtcEp.addIceCandidate(candidate, onerror)
  
        });
  
  
  
        webRtcEp.on('OnIceCandidate', function(event) {
  
          var candidate = event.candidate;
  
  
  
          console.log("Remote candidate:",candidate);
  
  
  
          webRtcPeer.addIceCandidate(candidate, onerror);
  
        });
  
      }
  
  
  
  
  
      function setIceCandidateCallbacks2(webRtcPeer, rtpEp, onerror)
  
      {
  
        webRtcPeer.on('icecandidate', function(candidate) {
  
          console.log("Localr candidate:",candidate);
  
  
  
          candidate = kurentoClient.getComplexType('IceCandidate')(candidate);
  
  
  
          rtpEp.addIceCandidate(candidate, onerror)
  
        });
  
      }
  
  
  
  
  
      window.addEventListener('load', function()
  
      {
  
        console = new Console();
  
  
  
        var webRtcPeer;
  
        var pipeline;
  
        var webRtcEpt;
  
  
  
        var videoInput = document.getElementById('videoInput');
  
        var videoOutput = document.getElementById('videoOutput');
  
  
  
        var startButton = document.getElementById("start");
  
        var stopButton = document.getElementById("stop");
  
  
  
        startButton.addEventListener("click", function()
  
        {
  
          showSpinner(videoInput, videoOutput);
  
  
  
          var options = {
  
            localVideo: videoInput,
  
            remoteVideo: videoOutput
  
          };
  
  
  
  
  
          if (args.ice_servers) {
  
           console.log("Use ICE servers: " + args.ice_servers);
  
           options.configuration = {
  
             iceServers : JSON.parse(args.ice_servers)
  
           };
  
          } else {
  
           console.log("Use freeice")
  
          }
  
  
  
          webRtcPeer = kurentoUtils.WebRtcPeer.WebRtcPeerSendrecv(options, function(error)
  
          {
  
            if(error) return onError(error)
  
  
  
            this.generateOffer(onOffer)
  
          });
  
  
  
          function onOffer(error, sdpOffer)
  
          {
  
            if(error) return onError(error)
  
  
  
            kurentoClient(args.ws_uri, function(error, client)
  
            {
  
              if(error) return onError(error);
  
  
  
              client.create("MediaPipeline", function(error, _pipeline)
  
              {
  
                if(error) return onError(error);
  
  
  
                pipeline = _pipeline;
  
  
  
                pipeline.create("WebRtcEndpoint", function(error, webRtc){
  
                  if(error) return onError(error);
  
  
  
                  webRtcEpt = webRtc;
  
  
  
                  setIceCandidateCallbacks(webRtcPeer, webRtc, onError)
  
  
  
                  webRtc.processOffer(sdpOffer, function(error, sdpAnswer){
  
                    if(error) return onError(error);
  
  
  
                    webRtcPeer.processAnswer(sdpAnswer, onError);
  
                  });
  
                  webRtc.gatherCandidates(onError);
  
  
  
                  webRtc.connect(webRtc, function(error){
  
                    if(error) return onError(error);
  
  
  
                    console.log("Loopback established");
  
                  });
  
                });
  
  
  
  
  
  
  
              pipeline.create("RtpEndpoint", function(error, rtp){
  
                  if(error) return onError(error);
  
  
  
                  //setIceCandidateCallbacks2(webRtcPeer, rtp, onError)
  
  
  
  
  
                  var cm_offer = "v=0\n" +
  
                        "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +
  
                        "s=nginx\n" +
  
                        "c=IN IP4 127.0.0.1\n" +
  
                        "t=0 0\n" +
  
                        "m=audio 60820 RTP/AVP 0\n" +
  
                        "a=rtpmap:0 PCMU/8000\n" +
  
                        "a=recvonly\n" +
  
                        "m=video 59618 RTP/AVP 101\n" +
  
                        "a=rtpmap:101 H264/90000\n" +
  
                        "a=recvonly\n";
  
  
  
  
  
  
  
                  rtp.processOffer(cm_offer, function(error, cm_sdpAnswer){
  
                    if(error) return onError(error);
  
  
  
                    //webRtcPeer.processAnswer(cm_sdpAnswer, onError);
  
                  });
  
                  //rtp.gatherCandidates(onError);
  
  
  
                  webRtcEpt.connect(rtp, function(error){
  
                    if(error) return onError(error);
  
  
  
                    console.log("RTP endpoint connected to webRTC");
  
                  });
  
                });
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
              });
  
            });
  
          }
  
        });
  
        stopButton.addEventListener("click", stop);
  
  
  
  
  
        function stop() {
  
          if (webRtcPeer) {
  
            webRtcPeer.dispose();
  
            webRtcPeer = null;
  
          }
  
  
  
          if(pipeline){
  
            pipeline.release();
  
            pipeline = null;
  
          }
  
  
  
          hideSpinner(videoInput, videoOutput);
  
        }
  
  
  
        function onError(error) {
  
          if(error)
  
          {
  
            console.error(error);
  
            stop();
  
          }
  
        }
  
      })
  
  
  
  
  
      function showSpinner() {
  
        for (var i = 0; i < arguments.length; i++) {
  
          arguments[i].poster = 'img/transparent-1px.png';
  
          arguments[i].style.background = "center transparent url('img/spinner.gif') no-repeat";
  
        }
  
      }
  
  
  
      function hideSpinner() {
  
        for (var i = 0; i < arguments.length; i++) {
  
          arguments[i].src = '';
  
          arguments[i].poster = 'img/webrtc.png';
  
          arguments[i].style.background = '';
  
        }
  
      }
  
  
  
      /**
  
       * Lightbox utility (to display media pipeline image in a modal dialog)
  
       */
  
      $(document).delegate('*[data-toggle="lightbox"]', 'click', function(event) {
  
        event.preventDefault();
  
        $(this).ekkoLightbox();
  
      });

• RTP packets detected as UDP

  8 juillet 2024, par fritz

  Here is what I am trying to do :

  



  WebRTC endpoint > RTP Endpoint > ffmpeg > RTMP server.


  



  This is what my SDP file looks like.

  



  var cm_offer = "v=0\n" +
              "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +
              "s=nginx\n" +
              "c=IN IP4 127.0.0.1\n" +
              "t=0 0\n" +
              "m=audio 60820 RTP/AVP 0\n" +
              "a=rtpmap:0 PCMU/8000\n" +
              "a=recvonly\n" +
              "m=video 59618 RTP/AVP 101\n" +
              "a=rtpmap:101 H264/90000\n" +
              "a=recvonly\n";


  



  What's happening is that wireshark can detect the incoming packets at port 59618, but not as RTP packets but UDP packets. I am trying to capture the packets using ffmpeg with the following command :

  



  ubuntu@ip-132-31-40-100:~$ ffmpeg -i udp://127.0.0.1:59618 -vcodec copy stream.mp4
ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  libavutil      55. 44.100 / 55. 44.100
  libavcodec     57. 75.100 / 57. 75.100
  libavformat    57. 63.100 / 57. 63.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 69.100 /  6. 69.100
  libavresample   3.  2.  0 /  3.  2.  0
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100 


  



  All I get is a blinking cursor and The stream.mp4 file is not written to disk after I exit (ctrl+c).

  



  So can you help me figure out :

  



  

  1. why wireshark cannot detect the packets as RTP (I suspect it has something to do with SDP)

  


  2. How to handle SDP answer when the RTP endpoint is pushing to ffmpeg which doesn't send an answer back.

  


  



  Here is the entire code (hello world tutorial modified)

  



  /*
     * (C) Copyright 2014-2015 Kurento (http://kurento.org/)
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    function getopts(args, opts)
    {
      var result = opts.default || {};
      args.replace(
          new RegExp("([^?=&]+)(=([^&]*))?", "g"),
          function($0, $1, $2, $3) { result[$1] = decodeURI($3); });

      return result;
    };

    var args = getopts(location.search,
    {
      default:
      {
        ws_uri: 'wss://' + location.hostname + ':8433/kurento',
        ice_servers: undefined
      }
    });

    function setIceCandidateCallbacks(webRtcPeer, webRtcEp, onerror)
    {
      webRtcPeer.on('icecandidate', function(candidate) {
        console.log("Local candidate:",candidate);

        candidate = kurentoClient.getComplexType('IceCandidate')(candidate);

        webRtcEp.addIceCandidate(candidate, onerror)
      });

      webRtcEp.on('OnIceCandidate', function(event) {
        var candidate = event.candidate;

        console.log("Remote candidate:",candidate);

        webRtcPeer.addIceCandidate(candidate, onerror);
      });
    }


    function setIceCandidateCallbacks2(webRtcPeer, rtpEp, onerror)
    {
      webRtcPeer.on('icecandidate', function(candidate) {
        console.log("Localr candidate:",candidate);

        candidate = kurentoClient.getComplexType('IceCandidate')(candidate);

        rtpEp.addIceCandidate(candidate, onerror)
      });
    }


    window.addEventListener('load', function()
    {
      console = new Console();

      var webRtcPeer;
      var pipeline;
      var webRtcEpt;

      var videoInput = document.getElementById('videoInput');
      var videoOutput = document.getElementById('videoOutput');

      var startButton = document.getElementById("start");
      var stopButton = document.getElementById("stop");

      startButton.addEventListener("click", function()
      {
        showSpinner(videoInput, videoOutput);

        var options = {
          localVideo: videoInput,
          remoteVideo: videoOutput
        };


        if (args.ice_servers) {
         console.log("Use ICE servers: " + args.ice_servers);
         options.configuration = {
           iceServers : JSON.parse(args.ice_servers)
         };
        } else {
         console.log("Use freeice")
        }

        webRtcPeer = kurentoUtils.WebRtcPeer.WebRtcPeerSendrecv(options, function(error)
        {
          if(error) return onError(error)

          this.generateOffer(onOffer)
        });

        function onOffer(error, sdpOffer)
        {
          if(error) return onError(error)

          kurentoClient(args.ws_uri, function(error, client)
          {
            if(error) return onError(error);

            client.create("MediaPipeline", function(error, _pipeline)
            {
              if(error) return onError(error);

              pipeline = _pipeline;

              pipeline.create("WebRtcEndpoint", function(error, webRtc){
                if(error) return onError(error);

                webRtcEpt = webRtc;

                setIceCandidateCallbacks(webRtcPeer, webRtc, onError)

                webRtc.processOffer(sdpOffer, function(error, sdpAnswer){
                  if(error) return onError(error);

                  webRtcPeer.processAnswer(sdpAnswer, onError);
                });
                webRtc.gatherCandidates(onError);

                webRtc.connect(webRtc, function(error){
                  if(error) return onError(error);

                  console.log("Loopback established");
                });
              });



            pipeline.create("RtpEndpoint", function(error, rtp){
                if(error) return onError(error);

                //setIceCandidateCallbacks2(webRtcPeer, rtp, onError)


                var cm_offer = "v=0\n" +
                      "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +
                      "s=nginx\n" +
                      "c=IN IP4 127.0.0.1\n" +
                      "t=0 0\n" +
                      "m=audio 60820 RTP/AVP 0\n" +
                      "a=rtpmap:0 PCMU/8000\n" +
                      "a=recvonly\n" +
                      "m=video 59618 RTP/AVP 101\n" +
                      "a=rtpmap:101 H264/90000\n" +
                      "a=recvonly\n";



                rtp.processOffer(cm_offer, function(error, cm_sdpAnswer){
                  if(error) return onError(error);

                  //webRtcPeer.processAnswer(cm_sdpAnswer, onError);
                });
                //rtp.gatherCandidates(onError);

                webRtcEpt.connect(rtp, function(error){
                  if(error) return onError(error);

                  console.log("RTP endpoint connected to webRTC");
                });
              });









            });
          });
        }
      });
      stopButton.addEventListener("click", stop);


      function stop() {
        if (webRtcPeer) {
          webRtcPeer.dispose();
          webRtcPeer = null;
        }

        if(pipeline){
          pipeline.release();
          pipeline = null;
        }

        hideSpinner(videoInput, videoOutput);
      }

      function onError(error) {
        if(error)
        {
          console.error(error);
          stop();
        }
      }
    })


    function showSpinner() {
      for (var i = 0; i < arguments.length; i++) {
        arguments[i].poster = 'img/transparent-1px.png';
        arguments[i].style.background = "center transparent url('img/spinner.gif') no-repeat";
      }
    }

    function hideSpinner() {
      for (var i = 0; i < arguments.length; i++) {
        arguments[i].src = '';
        arguments[i].poster = 'img/webrtc.png';
        arguments[i].style.background = '';
      }
    }

    /**
     * Lightbox utility (to display media pipeline image in a modal dialog)
     */
    $(document).delegate('*[data-toggle="lightbox"]', 'click', function(event) {
      event.preventDefault();
      $(this).ekkoLightbox();
    });